Vat dyes of the anthraquinone series.



UNITE STATES f? QFFICE,

HEINRICH NEEESHEIMER, OF LUDWIGSHAFEN-ON-THE-EHINE, GERMANY, ASSIGNQR TO BADISCHE ANILIN & SQ DA FABBIK, OF LUDWIGSHAFEN-ON-THE-RHINE, GER- MANY, A CORPORATION.

VAT DYES OF THE ANTHRAQUiNONE SERIES.

1,052,507. No Drawing T 0 all whom it may concern:

Be it known that I, HEINRICH. NERE- SHEIMER, subject of the Queen of the Netherlands, residing at Ludwigshafen-on-the- Rhine, Germany, have invented new and useful Improvements in Vat Dyes of the Anthraquinone Series, of which the following is a specification.

I have found that by subjecting anthraquinone-acridones substituted with halogen in the benzene residue to treatment with a nitrating agent and then reducing the nitro compounds thus-obtained, coloring matters are produced which dye cotton, from a vat, from blue to bluish green shadesof excellent fastness.

My new coloring matters consist, when dry, of blue to blue-green powders which are insoluble in dilute acids and alkalis, but are soluble in nitrobenzene and in anilin yielding from blue to blue-green soln tions, and in concentrated sulfuric acid yielding red to brown solutions.

The followingexamples will serve to illustrate further the nature of my invention, which, however, is not confined to these examples. The parts are by weight.

Example 1: Suspend 100 parts of chloranthraquinone-acridone (obtainable by treating anthraquinoneacridone with sulfuryl chlorid in the presence of monochlorbenzene) in 1,000 parts of nitrobenzene, and, add gradually, while stirring Well, at the temperature of the Water-bath, 150 parts of 87% nitric acid. .The reaction is complete when a test portion, after being fil tered and'washed with alcohol and reduced with alkaline hydrosulfite solution, dyes, from a vat, blueshades on cotton. Allow the melt to cool, filter and wash the residue with alcohol. In order to reduce the nitro compound thus obtained, heat one part thereof in a finely divided state with 100 parts of water, 2 parts of 24% caustic. sodasolution, and 10 arts of sodium hydrosulfite solution of 10 e. for 30 minutes at from 90 to 95 G. Then complete the precipitation of the coloring matter, if necessary, by blowing air through the solution and filter off and wash the said coloringinatter with water. It dyes, from a vat, blue shades on cotton and is, when dry, a blue powder which is insoluble in the usual solvents, but yields blue solutions in nitrobenzene and in Specification of Letters Patent.

anilin, and a reddish yellow solution in concentrated sulfuric acid.

Example 2: Introduce, while stirring, Well, a paste of 100 parts .of 'monobromanthraquinone-acridone and 150 parts of sulfuric acid monohydrate into 400 parts of a mixture containing 86.4% of nitric acid and 13.6% of sulfuric acid, at a1temperature of from -5 to -l0 C. WVhen the nitration is complete, poun'the 'giixture on ice, filter, and wash the residue with hot water and with dilute caustiosoda solution,

in order to remove by-products. ,Thc paste obtained can be directly reduced in the manner described in the foregoingEXample 1, whereupon a coloring matter is obtained which dyes, from a vat, bluish green shades on cotton. When dry, it is a blue-green powder Which is somewhat soluble in anilin and in benzene, yielding blue-green solutions. It dissolves in concentrated sulfuric acid, the solution being yellow-red.

, Example 3: Introduce 100 parts of dichlor-anthraquinoneacridone, of a composition corresponding to the formula (obtainable from the ethyl ester of l-chloranthraquinone-2-carboxylic acid and 2.4- dichlor-anilin into five hundred parts of 87% nitric acid, while maintaining a temperature below 0 C. It gives a brownyellow solution. nitro compound begins to separate out and is complete in about one hour. Then filter off the precipitate and wash it, first with Patented Feb. 1-1, 1913.

Application filed October 11, 1912. Serial No. 725,151.

After a short time, the

glacial acetic acid and then with water, and

dry it. In order to reduce it, heat it in a finely divided state with a'solution of 130 parts of sodium sulfid in 1300 parts of water, for 1 hour, at from 80 to 90 C. Then solution in nitrobenzene andin anilin, and

agent and then reducing the nitro compound thus obtained.

2. The process of producing a yat dye of the anthraquinone series by treating 2.4;-

. dichlor-anthraquinone-acridone, containing ino; anthraquinone acridones the chlorin atoms in the benzene residue, with nitric acid and then reducing the nitro compound .thus obtained 7 The new vat dyes being probably amsubstituted with halogen in the benzene residue, which consist, when dr of from blue to bluegreen powders, w ich are insoluble in dilute acids and alkalis, but which yield blue to blue-green solutions in nitrobenzene and in anilin, and from red to brownsoiutions in containing the chlorin atoms in the benzene residue, which, when dry, is a dark blue powder which is insoluble in dilute acids and alkalis, but which yields a greenish blue solution in nitrobenzene andin anilin, and a brown-yellow solution in concentrated sulfuric acid, and which dyes cotton, from a vat, greenish blue.

In testimony whereof I ,have hereunto set my hand in the presence of two subscribing witnesses.

HEINRICH NERESHEIMER.

Witnesses:

J. ALEc. LLOYD, Josnrn I'IEIFFER. 

